Collection.php

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<?php

declare(strict_types=1);

namespace ILIAS\Export\ImportHandler\Schema;

use ILIAS\Export\ImportHandler\I\Schema\CollectionInterface as SchemaCollectionInterface;
use ILIAS\Export\ImportHandler\I\Schema\HandlerInterface as SchemaInterface;

class Collection implements SchemaCollectionInterface
{
    protected array $elements;
    protected int $index;

    public function __construct()
    {
        $this->elements = [];
        $this->index = 0;
    }

    public function count(): int
    {
        return count($this->elements);
    }

    public function withElement(
        SchemaInterface $element
    ): SchemaCollectionInterface {
        $clone = clone $this;
        $clone->elements[] = $element;
        return $clone;
    }

    public function withMerged(
        SchemaCollectionInterface $other
    ): SchemaCollectionInterface {
        $clone = clone $this;
        $clone->elements = array_merge($clone->elements, $other->toArray());
        return $clone;
    }

    public function toArray(): array
    {
        return $this->elements;
    }

    public function current(): SchemaInterface
    {
        return $this->elements[$this->index];
    }

    public function next(): void
    {
        $this->index++;
    }

    public function key(): int
    {
        return $this->index;
    }

    public function valid(): bool
    {
        return isset($this->elements[$this->index]);
    }

    public function rewind(): void
    {
        $this->index = 0;
    }
}